CN102497950A - Ball end mill - Google Patents

Ball end mill Download PDF

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Publication number
CN102497950A
CN102497950A CN2010800407944A CN201080040794A CN102497950A CN 102497950 A CN102497950 A CN 102497950A CN 2010800407944 A CN2010800407944 A CN 2010800407944A CN 201080040794 A CN201080040794 A CN 201080040794A CN 102497950 A CN102497950 A CN 102497950A
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CN
China
Prior art keywords
shear blade
axis
slotting cutter
long
rotation
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Granted
Application number
CN2010800407944A
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Chinese (zh)
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CN102497950B (en
Inventor
畔上贵行
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Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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Publication of CN102497950A publication Critical patent/CN102497950A/en
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Publication of CN102497950B publication Critical patent/CN102497950B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C5/00Milling-cutters
    • B23C5/02Milling-cutters characterised by the shape of the cutter
    • B23C5/10Shank-type cutters, i.e. with an integral shaft
    • B23C5/1009Ball nose end mills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C2210/00Details of milling cutters
    • B23C2210/04Angles
    • B23C2210/0485Helix angles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C2210/00Details of milling cutters
    • B23C2210/28Arrangement of teeth
    • B23C2210/282Unequal angles between the cutting edges, i.e. cutting edges unequally spaced in the circumferential direction
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00Cutters, for shaping
    • Y10T407/19Rotary cutting tool
    • Y10T407/1946Face or end mill
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00Cutters, for shaping
    • Y10T407/19Rotary cutting tool
    • Y10T407/1946Face or end mill
    • Y10T407/1948Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00Cutters, for shaping
    • Y10T407/19Rotary cutting tool
    • Y10T407/1952Having peripherally spaced teeth
    • Y10T407/1956Circumferentially staggered
    • Y10T407/1958Plural teeth spaced about a helix

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

In the tip section of an end mill body which is rotated about the axis thereof, a plurality of end cutting edges are formed in such a way as to extend from the inside of the front end of the tip section to the outside of the rear end thereof. In the outer periphery section of the end mill body, there are formed a plurality of peripheral cutting edges which extend to the rear end in such a way as to string out along the outer ends of the end cutting edges. Some of the plurality of end cutting edges are long end cutting edges extending from near that portion of the axis of the end mill body which is in the tip section. The angle which is formed, in an arbitrary cross section intersecting the axis at right angles, by the straight line that connects the axis to a peripheral cutting edge stringing out along a long end cutting edge and by the straight line that connects the axis to a peripheral cutting edge stringing out along the nearest end cutting edge positioned forward of the long end cutting edge in the rotation direction of the end mill, is larger than the angle which is formed, in a view looking at the tip section in the direction of the axis, by the tangent line at the inner end of the aforementioned long end cutting edge and the tangent line at the inner end of the nearest end cutting edge positioned forward of the long end cutting edge in the rotation direction of the end mill.

Description

Ball end mill
Technical field
The application is willing to that based on the spy of application on September 14th, 2009 2009-212128 requires priority, and here cites its content.
The present invention relates to a kind of ball end mill, at the leading section around the slotting cutter main body of axis rotation, separating unequal interval ground in a circumferential direction, to be formed with around the rotational trajectory of this axis be hemispheric a plurality of shear blade.
Background technology
Be formed with the ball end mill of cutting edge as unequal interval ground in a circumferential direction like this; A kind of ball end mill is for example proposed in patent documentation 1; Among a plurality of peripheral edge of the periphery that is formed at the slotting cutter main body; The helical angle of at least one peripheral edge is different with other peripheral edge, is formed with rotational trajectory at the front end of this peripheral edge and forms hemispheric circular-arc shear blade.In addition, in patent documentation 2, propose a kind of ball end mill, when axis direction was observed the front end of ball end mill, a plurality of shear blades formed the convex curve of mutually different radius of curvature, and their intervals in a circumferential direction are made as unequal interval.
So, peripheral edge and shear blade interval in a circumferential direction are being made as in the ball end mill of unequal interval, the incision of these cutting edges be cut material cycle might not, and the vibration when this cuts is cancelled.In view of the above, can prevent that the resonance like infringement machined surface precision etc. from being the generation of so-called high frequency chatter.
Patent documentation 1: Japan Patent discloses clear 62-203710 communique
Patent documentation 2: the open 2006-224254 communique of Japan Patent
Yet; This ball end mill especially shear blade be more than four swords situation etc. down; If will the inner of all shear blades be disposed near the slotting cutter rotation of slotting cutter body front end portion, can interfere with other shear blades owing to be used to form the emery wheel of shear blade, therefore difficulty on making.So; When for example shear blade is four swords; Two shear blades are made as the long shear blade that extends from the said near axis of slotting cutter body front end portion; And remaining two shear blades are made as the short shear blade of its inner from extending away from the position of said axis than said long shear blade, and these long shear blades of alternate configurations and lack shear blade in a circumferential direction.
Therefore, because long shear blade is compared short shear blade, cutting edge is longer towards the length of near axis, thus generate more smear metal, and at this near axis, the width and the degree of depth of central channel reduce, and the chip pocket of discharging smear metal is increased.Therefore, the smear metal that is generated is flowed to the rear end of slotting cutter main body periphery under compressed state.And then, via comparing the chip area discharge that the said peripheral edge that is formed at slotting cutter main body peripheral part is positioned at direction of rotation the place ahead of slotting cutter.
But; Shown in the ball end mill that said patent documentation 1 is put down in writing; If the helical angle of peripheral edge is made as difference; Then when the helical angle of the peripheral edge that links to each other with the outer end of said long shear blade during, compare the groove width of chip area that the peripheral edge that links to each other with this long shear blade is formed at direction of rotation the place ahead of slotting cutter and reduce gradually along with the rear end of trend slotting cutter less than the peripheral edge in the direction of rotation the place ahead that is positioned at slotting cutter.Therefore, the smear metal that is compressed and flows into chip area as stated might further be compressed and produce smear metal and stop up.
In addition; In the ball end mill that patent documentation 2 is put down in writing; If among the different a plurality of shear blades of radius of curvature; The radius of curvature of short shear blade is little than the radius of curvature of long shear blade, then compares the chip pocket that this long shear blade is formed at direction of rotation the place ahead of slotting cutter and also can reduce gradually along with the rear end periphery that tends to slotting cutter.Therefore, especially in the cutting that is easy to produce the hard-cutting material that smear metal stops up etc., before the chip area that arrives slotting cutter main body peripheral part, will produce smear metal and stop up.
Summary of the invention
Ball end mill of the present invention; Leading section in the slotting cutter main body of rotating around axis; Around the rotational trajectory of said axis for hemispheric a plurality of shear blades of on this axis, having the center from the front end inboard of said leading section in a circumferential direction devices spaced apart ground extend and form in the outside to the back-end; And peripheral part in said slotting cutter main body; The a plurality of peripheral edge devices spaced apart ground formation in a circumferential direction that links to each other and extend to the back-end with the outer end of said shear blade; A part of shear blade among said a plurality of shear blade is the long shear blade from the said near axis extension of the leading section of said slotting cutter main body; Compare the formed angle of tangent line on the inner of tangent line and the shear blade in the slotting cutter direction of rotation the place ahead that is positioned at this long shear blade on the inner of this long shear blade when the front end of said axis direction is observed, with the section of said axis quadrature on binding and this long shear blade and be positioned at two peripheral edge that the shear blade in slotting cutter direction of rotation the place ahead of this long shear blade links to each other and two formed angles of straight line of this axis bigger.
That is, ball end mill of the present invention comprises: the slotting cutter main body; A plurality of shear blades; Be formed at the leading section of said slotting cutter main body; When the axis that makes said slotting cutter main body with its length direction is the center rotation; The rotational trajectory of each shear blade is for having the hemispherical of center in said a plurality of shear blade on said axis, and said a plurality of shear blades devices spaced apart ground on the circumferencial direction of said slotting cutter main body forms, and extends and form in the outside to the back-end from the front end inboard of said leading section respectively; And a plurality of peripheral edge, at the peripheral part of said slotting cutter main body, devices spaced apart ground forms on the circumferencial direction of said slotting cutter main body, and said a plurality of peripheral edge link to each other with the outer end of said a plurality of shear blades respectively and extend to the rear end of said slotting cutter main body.Several shear blades among said a plurality of shear blade are longer than other shear blades, and are the long shear blade that the said near axis from the leading section of said slotting cutter main body extends to the outside, said rear end.
And then; Will with the section arbitrarily of said axis quadrature on link the peripheral edge that links to each other with said long shear blade and said axis straight line and binding with compare the peripheral edge that said other shear blades that said long shear blade is positioned at direction of rotation the place ahead of said slotting cutter main body link to each other and the formed angle of straight line of said axis and be made as first jiao; Will be when the front end of said axis direction be observed said leading section tangent line on the inner of said long shear blade when the formed angle of tangent line on comparing the inner of said other shear blades in direction of rotation the place ahead that said long shear blade is positioned at said slotting cutter main body is made as second jiao, first jiao greater than second jiao.
In the ball end mill that so constitutes; Compare at the front end of axis direction and observe the inner of duration shear blade and be positioned at the formed angle of tangent line (second jiao) of the inner of shear blade in direction of rotation the place ahead of slotting cutter than this long shear blade, with the section of said axis quadrature on two formed angles of straight line (first jiao) of two peripheral edge linking to each other with these shear blades of binding and this axis bigger.In view of the above, beginning to compare the peripheral edge that links to each other with this long shear blade from long shear blade, to be formed at the chip pocket and the chip area in direction of rotation the place ahead of slotting cutter big more the closer to peripheral edge.The result is, also can be to the rear end of long shear blade periphery, and then successfully discharge the smear metal of the confined state that generates in part near the inner of long shear blade to chip area.
And then; For the angle that so makes said two peripheral edge greater than long shear blade with compare the angle of inner end portion of shear blade that this long shear blade is formed at direction of rotation the place ahead of slotting cutter, can also make this long shear blade with respect to the helical angle of said axis greater than comparing the helical angle of shear blade that this long shear blade is positioned at direction of rotation the place ahead of slotting cutter.In view of the above, when the front end of axis direction was observed said leading section, the angle in each position of this axis direction between the tangent line of these shear blades increased along with the trend peripheral edge gradually, therefore can more successfully discharge smear metal.In addition, if the helical angle of long shear blade is different from compare this long shear blade to be positioned at the helical angle of shear blade in direction of rotation the place ahead of slotting cutter, then the direction of the resistance of these shear blades when incision is cut material, load and size or incision cycle are also different.The result is that these will be cancelled out each other, thereby can suppress the generation of high frequency chatter.
In addition; Among said a plurality of shear blades; Compare the inner of shear blade that said long shear blade is positioned at direction of rotation the place ahead of slotting cutter and be positioned at the position away from said axis, the inner of comparing said long shear blade, said shear blade also can be the short shear blade that extends to the back-end from this position.In view of the above; When the front end of axis direction is observed the inner of this weak point shear blade with compare the inner of long shear blade at direction of rotation rear that this weak point shear blade is positioned at slotting cutter on the formed angle of tangent line less than the peripheral edge that links to each other with these long shear blades and weak point shear blade respectively with the section of said axis quadrature on formed angle, so can shorten by contrast from said short shear blade and cut the interval that being cut till material is cut to long shear blade.Therefore; Lack this weak point shear blade that generates less smear metal through long long shear blade and the cutting edge length that generates more smear metal of cutting edge length as stated, can realize the growing amount of smear metal, the size of smear metal and then the homogenising of the cutting resistance that shear blade receives.The result is, thereby can makes the life-span of shear blade evenly realize the slotting cutter life-time dilatation.
Shown in as described above, according to the present invention, the chip area of the peripheral edge that the special smear metal that in the inner, generates with compressed state links to each other with this long shear blade from the lateral, rear end of this long shear blade in long shear blade is successfully discharged.In view of the above, stop up even in the cutting of hard-cutting material, also be difficult to produce smear metal, and the resistance when suppressing cutting and the increase of load.The result can realize cut efficiently.
Description of drawings
Fig. 1 is the side view of an expression embodiment of the present invention.
Fig. 2 A is a front view of observing slotting cutter main body shown in Figure 1 from the front end of axes O direction.
Fig. 2 B is the Z-Z cutaway view of slotting cutter main body in Fig. 1.
The specific embodiment
In the embodiment of the present invention shown in Fig. 1, Fig. 2 A and Fig. 2 B, it is the roughly cylindric of center that slotting cutter main body 1 forms with the axes O.Rear end (right side among Fig. 1) in slotting cutter main body 1 is formed with handle of a knife portion 2, is formed with cutting blade 3 at front end.Slotting cutter main body 1 is through being installed to handle of a knife portion 2 on the main shaft of lathe, thereby in the rotation around axes O along direction of rotation T, the direction feeding that edge and axes O are intersected, and be cut material and carry out cut through cutting 3 pairs of blades.In addition, according to different situations, in the time of direction feeding that edge and axes O are intersected, also along from the rear end of slotting cutter main body 1 towards the direction feeding of the axes O of front end, thereby carry out cut to being cut material equally.
In the periphery of cutting blade 3, be formed with many (being four this embodiment) chip areas 4 that curl up along the rear of the direction of rotation T of slotting cutter along with the trend rear end towards the rear end from the front end of slotting cutter main body 1.And then in the arris portion of the outside of the wall in the place ahead of slotting cutter direction of rotation T, being formed with around the rotational trajectory formation of axes O respectively at these chip areas 4 is the peripheral edge 5 of a barrel surface at center with the axes O.
Be formed with at the leading section of each chip area 4 and make towards the said wall depression of this slotting cutter direction of rotation T and towards the central channel 6 of the front end of slotting cutter main body 1.In these central channels 6, be formed with respectively around the rotational trajectory of axes O in the outside arris portion of the wall in slotting cutter direction of rotation T the place ahead and form the protruding hemispherical circular-arc shear blade 7 that on this axes O, has the center.Promptly in this embodiment, be formed with four shear blades 7 at the cutting blade 3 of the leading section of slotting cutter main body 1, and be formed with four peripheral edge 5 that link to each other respectively with shear blade 7 in the periphery of leading section.In addition, these shear blades 7 also from the front end of slotting cutter main body 1 inboard (axes O) along said hemisphere face, along with curl up along the rear of slotting cutter direction of rotation T in the outside, trend rear end, and be connected in the front end of peripheral edge 5 smoothly respectively.
And, several among these shear blades 7 (in this embodiment being two) shear blade 7 in the leading section of slotting cutter main body 1 near the long shear blade 7A that extends of the outside to the back-end axes O.Here; With the section arbitrarily of axes O quadrature on; Promptly when the section of the slotting cutter main body 1 of observing the Z-Z line in Fig. 1 (with reference to Fig. 2 B), with the straight line C that links the peripheral edge 5A that links to each other with long shear blade 7A and axes O and binding with compare the peripheral edge 5B that shear blade 7B that long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead links to each other and the formed angle of straight line D (first jiao) of axes O and be made as α.In addition; When the front end of axes O direction is observed; Promptly when the axes O direction is observed the leading section of slotting cutter main body 1 (with reference to Fig. 2 A), the tangent line A on the inner 7a of long shear blade 7A is made as θ with the formed angle of tangent line B (second jiao) on comparing the inner 7b of shear blade 7B that long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead.At this moment, angle α is greater than angle θ.
Here; In this embodiment; Among four shear blades 7, clip a pair of shear blade 7 that axes O is positioned at side opposite each other and be long shear blade 7A; Another to shear blade 7 does, inner 7b is positioned at the inner 7a that the compares long shear blade 7A position away from axes O when the front end of axes O direction is observed, and from this position the short shear blade 7B that extends of the outside to the back-end.These long shear blade 7A and short shear blade 7B be alternate configurations in a circumferential direction.In addition, comprise these long shear blade 7A, the peripheral edge 5A that links to each other with this long shear blade 7A, short shear blade 7B and the peripheral edge 5B that links to each other with this weak point shear blade 7B etc., each one of slotting cutter main body 1 forms 180 ° about axes O and rotates symmetrical.
And then; In this embodiment; About the shear blade 7 that curls up to the rear of slotting cutter direction of rotation T along with the rear end of trend slotting cutter main body 1 helical angle with respect to axes O, long shear blade 7A with respect to the helical angle of axes O greater than comparing the short shear blade 7B in the place ahead that this long shear blade 7A is positioned at slotting cutter direction of rotation T with respect to the helical angle of axes O.In view of the above, the formed angle α of straight line C and straight line D is greater than tangent line A and the formed angle θ of tangent line B.Here, when the sum of shear blade that will be formed at slotting cutter main body 17 and peripheral edge 5 was made as N, the size of these angles θ, α was respectively θ<360 °/N, α>360 °/N.N=4 in this embodiment, so θ<90 °, α>90 °.For example, θ=80 °, α=95 ° in this embodiment.
In this embodiment, the total N of shear blade 7 and peripheral edge 5 is 4, and each one of slotting cutter main body 1 is 180 ° of rotation symmetries about axes O.In this such embodiment; When the front end of axes O direction is observed (with reference to Fig. 2 A), the tangent line A on the inner 7a of long shear blade 7A with compare the inner 7b of short shear blade 7B that this long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead on the formed angle θ of tangent line B less than the tangent line B on the inner of lacking shear blade 7B with compare the inner 7a of another long shear blade 7A that this weak point shear blade 7B is positioned at slotting cutter direction of rotation T the place ahead on the formed angle β of tangent line A '.For example, β=100 ° in this embodiment.
On the other hand; In peripheral edge 7; With the section of axes O quadrature on (with reference to Fig. 2 B), link the straight line C of the peripheral edge 5A that links to each other with long shear blade 7A and axes O and link the peripheral edge 5B that links to each other with weak point shear blade 7B greater than binding with the formed angle α of straight line D that compares peripheral edge 5B that short shear blade 7B that this long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead links to each other and axes O and the straight line D of axes O and binding with compare the peripheral edge 5A that another long shear blade 7A that this weak point shear blade 7B is positioned at slotting cutter direction of rotation T the place ahead links to each other and the formed angle γ of straight line C ' of axes O.For example, γ=85 ° in this embodiment.
Promptly in this embodiment, the magnitude relationship of the magnitude relationship of angle θ, β and angle α, γ is opposite.
In foregoing ball end mill, be formed with the chip pocket that is used to discharge smear metal that comprises central channel 6 and chip area 4 in the place ahead of the slotting cutter direction of rotation T of long shear blade 7A and the peripheral edge 5A that links to each other with this long shear blade 7A.In this embodiment; Because angle α is greater than angle θ; Therefore can be with in slotting cutter direction of rotation T the place ahead of long shear blade 7A and the peripheral edge 5A that links to each other with this long shear blade 7A, the circumferencial direction width of the chip pocket that is used for the smear metal discharge that is formed by central channel 6 and chip area 4 is guaranteed for big more the closer to peripheral edge 5A.
Therefore; Even this chip pocket must be little long shear blade 7A inner 7a and near the smear metal of generation be compressed; And see off to the outside, the rear end of slotting cutter main body 1 from central channel 6, also can be via guaranteeing to have more chip area 4 successfully to discharge smear metal near the peripheral edge 5A of the big more chip pocket of rear end width.In addition, even when hard-cutting material being easy to like this produce material that smear metal stops up and carrying out cut, can prevent also that compressed smear metal from producing to stop up in central channel 6 and chip area 4 to cause cutting resistance and load to increase.Consequently can realize smoothly and cutting efficiently.
In this embodiment, because the helical angle of long shear blade 7A is greater than the helical angle of lacking shear blade 7B, so angle α is greater than angle θ.In view of the above, the tangent line of each the locational long shear blade 7A that separates existence along the axes O direction with at the formed angle of the tangent line of same locational short shear blade 7B along with this position just becomes big more the closer to the rear end of the axes O direction of slotting cutter main body 1.And, in peripheral edge 5A, 5B, with as stated with the section of axes O quadrature on straight line C and the formed angle α of straight line D equate.Therefore, compare, can successfully discharge smear metal with the situation that this angle for example increases the closer to the rear end of slotting cutter main body more interimly.
And; Because such as previously mentioned long shear blade 7A is different with the helical angle of short shear blade 7B, direction, size or the incision cycle of long shear blade 7A and the short resistance of shear blade 7B when incision is cut material and load are different on each optional position of axes O direction.In view of the above, the vibration of the slotting cutter main body 1 that causes because of the resistance that acts on long shear blade 7A and short shear blade 7B and load is cancelled out each other.And then, can prevent because of resulting from the high frequency chatter that 1 resonance of slotting cutter main body produces.Consequently can further successfully carry out high-grade cut.
And then; In this embodiment; More disposing short shear blade 7B in the place ahead of slotting cutter direction of rotation T than long shear blade 7A, the tangent line A on the inner 7a of long shear blade 7A and compare on the inner 7b of short shear blade 7B that this long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead the formed angle θ of tangent line B less than the straight line C that links the peripheral edge 5A that links to each other with long shear blade 7A and axes O and binding with compare the peripheral edge 5B that short shear blade 7B that this long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead links to each other and the formed angle α of straight line D of axes O.In view of the above, being cut material from short shear blade 7B incision cuts the interval that is cut till the material and reduces to comparing long shear blade 7A that this weak point shear blade 7B is positioned at slotting cutter direction of rotation T rear.
Relative therewith, the tangent line B on the inner 7b of this weak point shear blade 7B with compare the inner 7a of another long shear blade 7A that this weak point shear blade 7B is positioned at slotting cutter direction of rotation T the place ahead on the formed angle β of tangent line A ' greater than the tangent line A on the inner 7a of long shear blade 7A with compare the inner 7b of short shear blade 7B that this long shear blade 7A is positioned at slotting cutter direction of rotation T the place ahead on the formed angle θ of tangent line B.That is, the cutting edge length of short shear blade 7B is shorter, thereby the load that is acted on is less.In view of the above, be cut material from long shear blade 7A incision and cut the interval increase that is cut till the material to comparing short shear blade 7B that this long shear blade 7A is positioned at slotting cutter direction of rotation T rear.
Therefore,, amount and the size of the smear metal that generates by long shear blade 7A and short shear blade 7B or the cutting resistance homogenising that each shear blade 7 receives as a whole can be made, and the life-span homogenising of long shear blade 7A and short shear blade 7B can be made according to this embodiment.In view of the above, owing to the lost of life of the shear blade that can prevent Yin Teding 7 causes the lost of life of slotting cutter main body 1 integral body, so can use all shear blades 7 equably to realize the slotting cutter life-time dilatation.
On the other hand, so discharge via the chip area 4 in the slotting cutter direction of rotation T the place ahead that is positioned at peripheral edge 5A, 5B with the smear metal that uniform amount generates through long shear blade 7A and short shear blade 7B.In this chip area 4, the size that on relevant with this groove width and the section axes O quadrature, links the last formed angle θ of tangent line A, B of size and the length shear blade 7A, the inner 7a of 7B, the 7b that link to each other with these peripheral edge 5A, 5B as stated of the formed angle α of straight line C, D, γ of peripheral edge 5A, 5B and this axes O, β on the contrary.
But its big or small difference is following in this embodiment: (β-θ) is 20 °, and therewith relatively, (α-γ) is 10 °, and the difference of angle α, γ is poor less than angle θ, β's for angle α, γ poor for angle θ, β poor.Therefore on the groove width of chip area 4, can't produce extreme width.Therefore, the smear metal that generates with uniform amount through long shear blade 7A and short shear blade 7B as stated can not stopped up in this chip area 4 and is discharged from.Therefore, can further promote smear metal to discharge smoothly, can realize cutting more efficiently.
Symbol description
1 slotting cutter main body
2 handle of a knife portions
3 cutting blades
4 chip areas
5 peripheral edge
The peripheral edge that 5A links to each other with long shear blade 7A
The peripheral edge that 5B links to each other with short shear blade 7B
6 central channels
7 shear blades
The long shear blade of 7A
The short shear blade of 7B
The inner of the long shear blade 7A of 7a
The inner of the short shear blade 7B of 7b
The axis of O slotting cutter main body 1
T slotting cutter direction of rotation
The tangent line of A on the inner 7a of the front end observation duration shear blade 7A of axes O direction
Tangent line when B observes at the front end of axes O direction on the inner 7b of short shear blade 7B
C with the section of axes O quadrature on link the straight line of peripheral edge 5A and axes O
D with the section of axes O quadrature on link the straight line of peripheral edge 5B and axes O
When θ observes at the front end of axes O direction, tangent line A with compare the formed angle of tangent line B that this tangent line A is positioned at slotting cutter direction of rotation T the place ahead
α with the section of axes O quadrature on, straight line C with compare the formed angle of straight line D that this straight line C is positioned at slotting cutter direction of rotation T the place ahead
When β observes at the front end of axes O direction, tangent line B with compare the formed angle of tangent line A that this tangent line B is positioned at slotting cutter direction of rotation T the place ahead
γ with the section of axes O quadrature on, straight line D with compare the formed angle of straight line C that this straight line D is positioned at slotting cutter direction of rotation T the place ahead

Claims (3)

1. ball end mill; Leading section in the slotting cutter main body of rotating around axis; Rotational trajectory around said axis forms for the hemispheric a plurality of shear blades that on this axis, have the center extend to the back-end from the front end inboard of said leading section to devices spaced apart in a circumferential direction
At the peripheral part of said slotting cutter main body, a plurality of peripheral edge devices spaced apart ground formation in a circumferential direction that links to each other and extend to the back-end with the outer end of said shear blade,
A part of shear blade among said a plurality of shear blade is the long shear blade near the extension of the said axis of the leading section of said slotting cutter main body,
With the section of said axis quadrature in; The peripheral edge that binding links to each other with said long shear blade and the straight line of said axis and link and compare the peripheral edge that shear blade that said long shear blade is positioned at slotting cutter direction of rotation the place ahead links to each other and the formed angle of straight line of said axis, greater than the tangent line on the inner of this long shear blade when the front end observation of said axis direction with compare the inner of shear blade that this long shear blade is positioned at slotting cutter direction of rotation the place ahead on the formed angle of tangent line.
2. ball end mill according to claim 1, said long shear blade is positioned at the helical angle of the shear blade in slotting cutter direction of rotation the place ahead with respect to said axis with respect to the helical angle of said axis greater than comparing this long shear blade.
3. ball end mill according to claim 1 and 2; Among said a plurality of shear blades; Compare the inner that said long shear blade is positioned at the shear blade in slotting cutter direction of rotation the place ahead and be positioned at the position away from said axis, the inner of comparing said long shear blade, said shear blade is the short shear blade that extends to the rear end of said slotting cutter main body from this position.
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CN104028821A (en) * 2013-03-05 2014-09-10 奥古斯特吕格贝格有限及两合公司 Arc rod milling cutter
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CN102717137A (en) * 2012-06-15 2012-10-10 常州液压成套设备厂有限公司 Ball-end milling cutter applicable to machining high-temperature alloy materials
CN104718039B (en) * 2012-10-29 2016-12-07 三菱综合材料株式会社 Slotting cutter with Cooling Holes
CN104718039A (en) * 2012-10-29 2015-06-17 三菱综合材料株式会社 End mill with coolant holes
CN104028821A (en) * 2013-03-05 2014-09-10 奥古斯特吕格贝格有限及两合公司 Arc rod milling cutter
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CN107073603B (en) * 2014-10-24 2019-05-03 京瓷株式会社 Slotting cutter
CN104526040A (en) * 2014-12-15 2015-04-22 安徽汇联机械工业有限公司 Wheel hub cutter
CN105127487A (en) * 2015-09-08 2015-12-09 广州番禺职业技术学院 Miniature four-blade drill bit and machining method thereof
WO2018176745A1 (en) * 2017-04-01 2018-10-04 深圳市鑫国钰精密工具有限公司 Ball nose cutter
CN109262038A (en) * 2018-10-29 2019-01-25 株洲钻石切削刀具股份有限公司 A kind of multi-functional rose cutter

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HK1168326A1 (en) 2012-12-28
EP2478983A1 (en) 2012-07-25
CN102497950B (en) 2014-07-16
EP2478983B1 (en) 2017-04-26
EP2478983A4 (en) 2013-04-10
US20120170984A1 (en) 2012-07-05
JP5499589B2 (en) 2014-05-21
WO2011030854A1 (en) 2011-03-17
JP2011056649A (en) 2011-03-24
US8690492B2 (en) 2014-04-08

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